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Bose 1801 Amplifier, 4401 Preamp 1 Page, 1973, QUAD, Articles and Info

End: 26.10. 2023 14:48:21 on Thursday
  • Condition: Used
  • Price: 6.43 EUR FESTPREIS
  • Status: unsold
  • Item number: 166376758715
  • Seller: effgjm (22380|98.8%)
  • Seller information: Commercial (with base shop)
  • Item location: Strongsville, Ohio USA
  • Ships to: Worldwide
  • Shipping: 3,0 EUR
  • on EBAY
  • Description

    This Advertisement is a reprint from 1973. It is professionally printed on glossy photo paper and is in Excellent condition! The Picture is the picture of the actual item. It is a beautiful piece of Audio History. I have THOUSANDS more from every major brand of Audio from 1950 up to now. ---Satisfaction is GUARANTEED at AV Archives! Take a look at my feedback for satisfied customers! I have been open since 2007 and have sold THOUSANDS of Ads, Reviews, and Brochures to satisfied customers. ---I Ship Worldwide and combine shipping, each additional item is just $1 after the first is paid. ---Each Page is 8.5 by 11 unless otherwise noted in title. ---Single Page, Single Sided Ads, unless otherwise noted in the title. ---These Ads are perfect for framing and placed in your Audio Room. ---I have a HUGE Vinyl Record Store with Thousands of Collectable records, and MANY First Pressings/Audiophile LPs. Just click on my Vinyl Record Store link on the left under categories. Email me for any specific questions, You will hear back from me usually within 4 hours, THANK YOU! Greg

Quad 44 pre-Amplifier repair AND update service -

End: 24.10. 2023 13:53:18 on Tuesday
  • Condition: Used
  • Price: 240.0 USD Auktion
  • Status: 6T 20:49:51
  • Item number: 256259675200
  • Bids: 0
  • Seller: (|%)
  • Seller information:
  • Item location: Solon,OH,USA USA
  • Ships to:
  • Shipping: 50,0 USD
  • on EBAY
  • Description

    This is a Quad 44 Repair and update service The repair and update service includes the following:Trouble shooting circuit boards replace damaged components with equivalent modern parts. Make pre-amplifier operational and perform update service. >All electrolytic capacitors will be replaced with high quality electrolytic capacitors. >Main power supply capacitors will be replaced with high quality electrolytic capacitors.>All ceramic capacitors will be replaced with high quality film and mica capacitors >The op amp ICs will be replaced with Burr Brown SoundPlus OPA134 op amp ICs with sockets. Additional modification requests are welcome!!!!

Quad 44 Preamplifier

End: 23.10. 2023 17:29:10 on Monday
  • Condition: Used
  • Price: 1007.31 USD FESTPREIS
  • Status: 29T 21:38:8
  • Item number: 225786716930
  • Seller: (|%)
  • Seller information:
  • Item location: Japan Japan
  • Ships to:
  • Shipping: 200,0 USD
  • on EBAY
  • Description

    DescriptionAll items are shown in the pictures. If you cannot tell from the pictures please contact us. Due to differences in region codes some games CDs DVDs etc. may not ?be available. The voltage of some electrical products may be different. Please make sure to check before purchasing. PaymentPlease pay within 2 days of winning the auction. Shipping There have been delays in delivery due to the global pandemic. There may be a significant delay in the scheduled delivery date. Delivery Time Economy delivery? 3 to 4 weeks (Tracking numbers are not reflected in Australia Canada and some regions.) Standard delivery 2 to 3 weeks Terms of Sale If payment is not confirmed within 2 days of purchase the order will be cancelled. Returns are accepted within 60 days.International Buyers - Please Note: Import duties and taxes are not included in the item price or shipping cost. Please check with your countrys customs office for additional costs before bidding or purchasing. Duties and taxes are not collected by the shipping company. Please check with your countrys customs office for additional costs before bidding or purchasing. The act of declaring goods at a lower value or declaring goods as gifts is prohibited by international governments. Shipping discounts are available for multiple purchases.We now accept more than just PayPal!Condition? MINT

Quad 44 pre-Amplifier repair AND update service -

End: 17.10. 2023 13:52:44 on Tuesday
  • Condition: Used
  • Price: 219.87 EUR Auktion
  • Status: unsold
  • Item number: 266449113473
  • Bids: 0
  • Seller: viktor6541 (2507|100.0%)
  • Seller information: non commercial
  • Item location: Solon, Ohio USA
  • Ships to: US
  • Shipping: 50,0 EUR
  • on EBAY
  • Description

    This is a Quad 44 Repair and update service The repair and update service includes the following:Trouble shooting circuit boards replace damaged components with equivalent modern parts. Make pre-amplifier operational and perform update service. >All electrolytic capacitors will be replaced with high quality electrolytic capacitors. >Main power supply capacitors will be replaced with high quality electrolytic capacitors.>All ceramic capacitors will be replaced with high quality film and mica capacitors >The op amp ICs will be replaced with Burr Brown SoundPlus OPA134 op amp ICs with sockets. Additional modification requests are welcome!!!!

Bose 1801 Amplifier, 4401 Preamp 1 Page, 1973, QUAD, Articles and Info

End: 13.10. 2023 15:09:46 on Friday
  • Condition: Used
  • Price: 6.41 EUR FESTPREIS
  • Status: unsold
  • Item number: 166365959024
  • Seller: effgjm (22376|98.8%)
  • Seller information: Commercial (with base shop)
  • Item location: Strongsville, Ohio USA
  • Ships to: Worldwide
  • Shipping: 3,0 EUR
  • on EBAY
  • Description

    This Advertisement is a reprint from 1973. It is professionally printed on glossy photo paper and is in Excellent condition! The Picture is the picture of the actual item. It is a beautiful piece of Audio History. I have THOUSANDS more from every major brand of Audio from 1950 up to now. ---Satisfaction is GUARANTEED at AV Archives! Take a look at my feedback for satisfied customers! I have been open since 2007 and have sold THOUSANDS of Ads, Reviews, and Brochures to satisfied customers. ---I Ship Worldwide and combine shipping, each additional item is just $1 after the first is paid. ---Each Page is 8.5 by 11 unless otherwise noted in title. ---Single Page, Single Sided Ads, unless otherwise noted in the title. ---These Ads are perfect for framing and placed in your Audio Room. ---I have a HUGE Vinyl Record Store with Thousands of Collectable records, and MANY First Pressings/Audiophile LPs. Just click on my Vinyl Record Store link on the left under categories. Email me for any specific questions, You will hear back from me usually within 4 hours, THANK YOU! Greg

Quad 44 pre-Amplifier repair AND update service -

End: 10.10. 2023 13:52:26 on Tuesday
  • Condition: Used
  • Price: 218.68 EUR Auktion
  • Status: unsold
  • Item number: 256241985462
  • Bids: 0
  • Seller: viktor6541 (2501|100.0%)
  • Seller information: non commercial
  • Item location: Solon, Ohio USA
  • Ships to: US
  • Shipping: 50,0 EUR
  • on EBAY
  • Description

    This is a Quad 44 Repair and update service The repair and update service includes the following:Trouble shooting circuit boards replace damaged components with equivalent modern parts. Make pre-amplifier operational and perform update service. >All electrolytic capacitors will be replaced with high quality electrolytic capacitors. >Main power supply capacitors will be replaced with high quality electrolytic capacitors.>All ceramic capacitors will be replaced with high quality film and mica capacitors >The op amp ICs will be replaced with Burr Brown SoundPlus OPA134 op amp ICs with sockets. Additional modification requests are welcome!!!!

Quad 44 pre-Amplifier repair AND update service -

End: 03.10. 2023 13:52:09 on Tuesday
  • Condition: Used
  • Price: 226.86 EUR Auktion
  • Status: unsold
  • Item number: 256233363697
  • Bids: 0
  • Seller: viktor6541 (2492|100.0%)
  • Seller information: non commercial
  • Item location: Solon, Ohio USA
  • Ships to: US
  • Shipping: 50,0 EUR
  • on EBAY
  • Description

    This is a Quad 44 Repair and update service The repair and update service includes the following:Trouble shooting circuit boards replace damaged components with equivalent modern parts. Make pre-amplifier operational and perform update service. >All electrolytic capacitors will be replaced with high quality electrolytic capacitors. >Main power supply capacitors will be replaced with high quality electrolytic capacitors.>All ceramic capacitors will be replaced with high quality film and mica capacitors >The op amp ICs will be replaced with Burr Brown SoundPlus OPA134 op amp ICs with sockets. Additional modification requests are welcome!!!!

Quad 44 Reasonable Preamplifier Working

End: 30.09. 2023 01:36:27 on Saturday
  • Condition: Used
  • Price: 630.7 EUR FESTPREIS
  • Status: unsold
  • Item number: 225777448412
  • Seller: jp-shop2018 (683|99.5%)
  • Seller information: Commercial (with base shop)
  • Item location: Japan Japan
  • Ships to: US
  • Shipping: 200,0 EUR
  • on EBAY
  • Description

    DescriptionAll items are shown in the pictures. If you cannot tell from the pictures please contact us. Due to differences in region codes some games CDs DVDs etc. may not ?be available. The voltage of some electrical products may be different. Please make sure to check before purchasing. PaymentPlease pay within 2 days of winning the auction. Shipping There have been delays in delivery due to the global pandemic. There may be a significant delay in the scheduled delivery date. Delivery Time Economy delivery? 3 to 4 weeks (Tracking numbers are not reflected in Australia Canada and some regions.) Standard delivery 2 to 3 weeks Terms of Sale If payment is not confirmed within 2 days of purchase the order will be cancelled. Returns are accepted within 60 days.International Buyers - Please Note: Import duties and taxes are not included in the item price or shipping cost. Please check with your countrys customs office for additional costs before bidding or purchasing. Duties and taxes are not collected by the shipping company. Please check with your countrys customs office for additional costs before bidding or purchasing. The act of declaring goods at a lower value or declaring goods as gifts is prohibited by international governments. Shipping discounts are available for multiple purchases.We now accept more than just PayPal!Condition? MINT

Quad 44 pre-Amplifier repair AND update service -

End: 26.09. 2023 13:51:40 on Tuesday
  • Condition: Used
  • Price: 227.74 EUR Auktion
  • Status: unsold
  • Item number: 266418039190
  • Bids: 0
  • Seller: viktor6541 (2485|100.0%)
  • Seller information: non commercial
  • Item location: Solon, Ohio USA
  • Ships to: US
  • Shipping: 50,0 EUR
  • on EBAY
  • Description

    This is a Quad 44 Repair and update service The repair and update service includes the following:Trouble shooting circuit boards replace damaged components with equivalent modern parts. Make pre-amplifier operational and perform update service. >All electrolytic capacitors will be replaced with high quality electrolytic capacitors. >Main power supply capacitors will be replaced with high quality electrolytic capacitors.>All ceramic capacitors will be replaced with high quality film and mica capacitors >The op amp ICs will be replaced with Burr Brown SoundPlus OPA134 op amp ICs with sockets. Additional modification requests are welcome!!!!

Quad 44 Pre Amplifier Late Charcoal Grey Model MM Phono

End: 25.09. 2023 19:46:12 on Monday
  • Condition: Used
  • Price: 585.19 EUR FESTPREIS
  • Status: unsold
  • Item number: 186053830321
  • Seller: topwug (1938|98.4%)
  • Seller information: non commercial
  • Item location: Sale Großbritannien
  • Ships to: GB
  • Shipping: 20,0 EUR
  • on EBAY
  • Description

    Quad 44 in grey, very good working condition, excellent Phono section, CD module fitted, radio and three levels of output to suit most power amplifiers, the case work has some paint marks and paint bubbling, sound great and one of quads best pre amps, comes with a manual and power lead. cash on collection welcome or will be well packed with signed for courier, thanks for looking

Vintage Quad 44 Control Amplifier Preamplifier Working

End: 20.09. 2023 22:34:42 on Wednesday
  • Condition: Used
  • Price: 272.07 EUR FESTPREIS
  • Status: unsold
  • Item number: 266418650690
  • Seller: sales12176 (469|100.0%)
  • Seller information: non commercial
  • Item location: San Antonio, Texas USA
  • Ships to: US
  • Shipping: 0,0 EUR
  • on EBAY
  • Description

    Vintage Quad 44 Control Amplifier Preamplifier Working. Condition is Used. Shipped with USPS Ground Advantage.

Quad 44 pre-Amplifier repair AND update service -

End: 19.09. 2023 11:19:12 on Tuesday
  • Condition: Used
  • Price: 227.37 EUR Auktion
  • Status: unsold
  • Item number: 266409240518
  • Bids: 0
  • Seller: viktor6541 (2483|100.0%)
  • Seller information: non commercial
  • Item location: Solon, Ohio USA
  • Ships to: US
  • Shipping: 50,0 EUR
  • on EBAY
  • Description

    This is a Quad 44 Repair and update service The repair and update service includes the following:Trouble shooting circuit boards replace damaged components with equivalent modern parts. Make pre-amplifier operational and perform update service. >All electrolytic capacitors will be replaced with high quality electrolytic capacitors. >Main power supply capacitors will be replaced with high quality electrolytic capacitors.>All ceramic capacitors will be replaced with high quality film and mica capacitors >The op amp ICs will be replaced with Burr Brown SoundPlus OPA134 op amp ICs with sockets. Additional modification requests are welcome!!!!

Quad 44 pre amplifier immaculate, recapped

End: 14.09. 2023 19:00:01 on Thursday
  • Condition: Used
  • Price: 340.63 EUR Auktion
  • Status: unsold
  • Item number: 155754130212
  • Bids: 0
  • Seller: matbro5 (295|100.0%)
  • Seller information: non commercial
  • Item location: Shaftesbury Großbritannien
  • Ships to: GB
  • Shipping: 6,85 EUR
  • on EBAY
  • Description

    Quad 44 pre amplifier immaculate, recapped. Beautiful cosmetic condition - no significant dinks or dents anywhere. See photos. The unit was re-capped by the excellent Peter Hickman at Fidele Audio. The unit sounds superb. On 14-Sep-23 at 12:02:45 BST, seller added the following information: Note on 14th Sept. The amp for re-sale is the one with the “500mV/22k”sticker on the rear panel, not the other one.

Quad 44 pre-Amplifier repair AND update service -

End: 12.09. 2023 11:09:00 on Tuesday
  • Condition: Used
  • Price: 227.91 EUR Auktion
  • Status: unsold
  • Item number: 256208065882
  • Bids: 0
  • Seller: viktor6541 (2482|100.0%)
  • Seller information: non commercial
  • Item location: Solon, Ohio USA
  • Ships to: US
  • Shipping: 50,0 EUR
  • on EBAY
  • Description

    This is a Quad 44 Repair and update service The repair and update service includes the following:Trouble shooting circuit boards replace damaged components with equivalent modern parts. Make pre-amplifier operational and perform update service. >All electrolytic capacitors will be replaced with high quality electrolytic capacitors. >Main power supply capacitors will be replaced with high quality electrolytic capacitors.>All ceramic capacitors will be replaced with high quality film and mica capacitors >The op amp ICs will be replaced with Burr Brown SoundPlus OPA134 op amp ICs with sockets. Additional modification requests are welcome!!!!

Quad 44 Pre Amplifier Late Charcoal Grey Model MM Phono

End: 11.09. 2023 13:39:58 on Monday
  • Condition: Used
  • Price: 491.8 EUR FESTPREIS
  • Status: sold
  • Item number: 354988609253
  • Seller: mikeaudio1981 (1313|99.2%)
  • Seller information: Commercial (with base shop)
  • Item location: London Großbritannien
  • Ships to: GB
  • Shipping: 59,36 EUR
  • on EBAY
  • Description

    Quad 44 Pre Amplifier Late Charcoal Grey Model MM PhonoQuad 44 grey pre amplifier has some marks but nothing to bad please check pictures. Its in fully working condition and sounds absolutely fantastic comes with power cable no original box. More then welcome a demo at my shop in south norwood Se256ef collection from this address too. Shipping with ups 48 hour fully insured International shipping welcome but please only through ebay International shipping Please check my other hifi items

QUAD 44 and 405 READ Description Pre and Power Amplifier

End: 05.09. 2023 15:21:29 on Tuesday
  • Condition: For parts or not working
  • Price: 166.46 EUR FESTPREIS
  • Status: sold
  • Item number: 166315765771
  • Seller: 23-dave (1981|100.0%)
  • Seller information: non commercial
  • Item location: Worthing Großbritannien
  • Ships to: GB
  • Shipping: 10,99 EUR
  • on EBAY
  • Description

    QUAD 44 and 405 READ Description Pre and Power AmplifierUntested withlots of rust on top of cases of both amplifiers . They look good inside but again sold as seen. Check over the photos please.Relisted due to timewaster who didnt look as the photos before buying. Yes its rusty . missing the card display in the window ontop .I will package very well as always.Please see photos for detail Please ask any questions Before buying Postage within UK Via DPD or Parcel force 48 and overseas by GSP Ebay Global shipping program.

Quad 44 pre-Amplifier repair AND update service -

End: 05.09. 2023 11:08:43 on Tuesday
  • Condition: Used
  • Price: 226.68 EUR Auktion
  • Status: unsold
  • Item number: 266391872406
  • Bids: 0
  • Seller: viktor6541 (2479|100.0%)
  • Seller information: non commercial
  • Item location: Solon, Ohio USA
  • Ships to: US
  • Shipping: 50,0 EUR
  • on EBAY
  • Description

    This is a Quad 44 Repair and update service The repair and update service includes the following:Trouble shooting circuit boards replace damaged components with equivalent modern parts. Make pre-amplifier operational and perform update service. >All electrolytic capacitors will be replaced with high quality electrolytic capacitors. >Main power supply capacitors will be replaced with high quality electrolytic capacitors.>All ceramic capacitors will be replaced with high quality film and mica capacitors >The op amp ICs will be replaced with Burr Brown SoundPlus OPA134 op amp ICs with sockets. Additional modification requests are welcome!!!!

QUAD 44 and 405 READ Description Pre and Power Amplifier

End: 05.09. 2023 08:10:43 on Tuesday
  • Condition: For parts or not working
  • Price: 165.97 EUR FESTPREIS
  • Status: sold
  • Item number: 166314574515
  • Seller: 23-dave (1981|100.0%)
  • Seller information: non commercial
  • Item location: Worthing Großbritannien
  • Ships to: GB
  • Shipping: 46,79 EUR
  • on EBAY
  • Description

    QUAD 44 and 405 READ Description Pre and Power AmplifierUntested withlots of rust on top of cases of both amplifiers . They look good inside but again sold as seen. Check over the photos please.I will package very well as always.Please see photos for detail Please ask any questions Before buying Postage within UK Via DPD or Parcel force 48 and overseas by GSP Ebay Global shipping program.

Quad 44 Pre Amplifier Quad 405-2 Amplifier Quad FM 4 Tuner

End: 03.09. 2023 18:26:07 on Sunday
  • Condition: Used
  • Price: 688.79 EUR FESTPREIS
  • Status: unsold
  • Item number: 394855559476
  • Seller: bopau-55 (57|100.0%)
  • Seller information: non commercial
  • Item location: Dalkeith Großbritannien
  • Ships to: GB
  • Shipping: 20,0 EUR
  • on EBAY
  • Description

    Quad 44 405 and FM4 all working as should excellent condition for age comes with power cables and interconnects plus original manuals and some service receipts sorry for cost of postage but very heavy will be well packed advertised elwhere so may be taken down

Quad 44 Pre Amplifier - excellent condition - original packaging

End: 03.09. 2023 18:05:01 on Sunday
  • Condition: Used
  • Price: 235.7 EUR Auktion
  • Status: sold
  • Item number: 386050603256
  • Bids: 17
  • Seller: audioavinstallations (641|100.0%)
  • Seller information: non commercial
  • Item location: Cheltenham Großbritannien
  • Ships to: GB
  • Shipping: 33,84 EUR
  • on EBAY
  • Description

    This Quad 44 PreAmplifier is presented in fantastic condition with original box, packaging, manual and accessories. Has been fully tested. See our other Quad listings including the matching tuner, power amplifier and wooden rack housing. Happy Bidding

Quad 44 pre amplifier - later model with CD and phono stages

End: 02.09. 2023 18:00:01 on Saturday
  • Condition: Used
  • Price: 302.15 EUR Auktion
  • Status: sold
  • Item number: 285449776533
  • Bids: 3
  • Seller: markgyll (1147|98.1%)
  • Seller information: non commercial
  • Item location: Devizes Großbritannien
  • Ships to: GB
  • Shipping: 15,0 EUR
  • on EBAY
  • Description

    A classic Quad 44 pre-amplifier which I was going to use in a second system but had a change of plan. The amplifier is in very good condition with some light wear to volume dial and tilt switches as pictured and some paint loss to the metal cover. These obviously have no effect on the operation of the amplifier. It is working really well and has a very good phono stage.I am also selling my quad 306 power amplifier which is a great match. If you buy both, I am happy to combine postage. If you have any questions, please ask.UK sale only, I will not post overseas.Postage by fully insured and tracked service.Security marked and tamper-proof seal applied to prevent fraud.

Quad 44 Pre Amplifier Quad 405-2 Amplifier Quad FM 4 Tuner

End: 01.09. 2023 16:06:12 on Friday
  • Condition: Used
  • Price: 654.94 EUR FESTPREIS
  • Status: unsold
  • Item number: 394849349391
  • Seller: bopau-55 (57|100.0%)
  • Seller information: non commercial
  • Item location: Dalkeith Großbritannien
  • Ships to: GB
  • Shipping: 20,0 EUR
  • on EBAY
  • Description

    Quad 44 405 and FM4 all working as should excellent condition for age comes with power cables and interconnects plus original manuals and some service receipts sorry for cost of postage but very heavy will be well packed

Preamplifier Model No. QUAD44 QUAD _83004

End: 13.08. 2023 13:04:10 on Sunday
  • Condition: Used
  • Price: 1151.69 EUR FESTPREIS
  • Status: unsold
  • Item number: 225690394843
  • Seller: japan-good-goods (1035|96.7%)
  • Seller information: Commercial (with base shop)
  • Item location: chiba Japan
  • Ships to: Worldwide
  • Shipping: 0,0 EUR
  • on EBAY
  • Description

    DescriptionAuthenticity: 100% AUTHENTIC! If you have any question about the condition, accessories, or anything about the product,Please feel free to message us. We are glad to answer all your concerns. ShippingDHL, Fedex Fastshipping3-10 business days after shipment(Tracking number + Insurance.)PaymentPlease give me the payment within 3days from the date of bid.About UsWe sell our items on other websites and in our retail stores in Japan at the same time.If the item was sold out before your purchase, your order will be cancelled and a full refund will be issued immediately. International Buyers - Please Note:Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyers responsibility. Please check with your countrys customs office to determine what these additional costs will be prior to bidding or buying.We do not mark merchandise values below value or mark items as - gifts - The US and International government regulations prohibit such behavior. Thank you.

Quad 44 Preamplifier Fully Serviced Repaired and Upgraded by Amplabs

End: 10.08. 2023 16:24:13 on Thursday
  • Condition: Used
  • Price: 463.48 EUR FESTPREIS
  • Status: sold
  • Item number: 354851726557
  • Seller: jabut_2504 (63|100.0%)
  • Seller information: non commercial
  • Item location: Peterborough Großbritannien
  • Ships to: GB
  • Shipping: 0,0 EUR
  • on EBAY
  • Description

    Quad 44 Preamplifier Fully Serviced, Repaired and Upgraded by Amplabs at a cost of £165: The service details are as follows: Physical external condition on receipt: Fair for age. Lower section of rear panel sub-assembly has corrosionon screws and internal struts and side of output panel.Initial faults: No sound on LHS and distorted sound on RHS.Action taken: Chassis & modular PSU dismantled & released from sleeve. Cleaned away carbon residuefrom PSU interior and fitted replacement long life 300Vac XY- rated, ceramic mains suppression capacitor.Removed corrosion from rear back plane assembly and fixings. Replaced corroded fixing screws. Signaloutput panel dismantled from back plane and corrosion cleaned away from outlet. Replaced corroded 4-pinDIN socket and fitted it to the outside of the panel for improved insertion depth. While the output panel wasaccessible, fitted RCA outlets in parallel with 500mV Din outlets.Carried out DC and AC signal tests to isolate faults: Missing signal on LHs traced to faulty op-ampsreplaced Op-amps and fitted IC holders. Balance control, Tilt, and filter level & select switch contacts cleaned& lubricated. Resoldered through-hole links on motherboard backplane. Input modules dismantled and rearconnection plane contacts cleaned. Din socket mouldings cleaned with IPA to remove, light-growth. Checkedvalue and ESR of set of electrolytic capacitors, replaced set of decoupling caps. Extra decoupling caps fittedto +/- rails on radio and aux/CD modules.Performed flat and RIAA, frequency response and distortion check on all inputs (spectrum analyser) –passed.? 8 hour listening test/soak test with in-house Quad 405-2 – passed.?PAT class 1(insulation and earth bonding test) – passed.?